Alright, let's solve this problem step by step. We have 739940927 and 553552865 and we're adding them together.

Step 1: We'll start by adding the digits 7 & 5 in column 1 and get 12.
We'll write down the last digit 2 and carry the 1 to the next column.

Step 2: We'll start by adding the digits 2 & 6 in column 2 and get 9.

Step 3: We'll start by adding the digits 9 & 8 in column 3 and get 17.
We'll write down the last digit 7 and carry the 1 to the next column.

Step 4: We'll start by adding the digits 0 & 2 in column 4 and get 3.

Step 5: We'll start by adding the digits 4 & 5 in column 5 and get 9.

Step 6: We'll start by adding the digits 9 & 5 in column 6 and get 14.
We'll write down the last digit 4 and carry the 1 to the next column.

Step 7: We'll start by adding the digits 9 & 3 in column 7 and get 13.
We'll write down the last digit 3 and carry the 1 to the next column.

Step 8: We'll start by adding the digits 3 & 5 in column 8 and get 9.

Step 9: We'll start by adding the digits 7 & 5 in column 9 and get 12.
We'll write down the last digit 2 and carry the 1 to the next column.

So, 739940927 + 553552865 = 1293493792.

